Strawberry Chocolate Chip Muffins

frozen strawberries, roughly chopped into 1/2-inch pieces (allow to come to room temp for about 10 minutes, or until they can be chopped; do not thaw completely)

all-purpose flour, for tossing with strawberries

all-purpose flour

granulated sugar (use 1 cup if your berries are tart or you prefer sweeter muffins)

baking powder

cinnamon

salt, optional and to taste

large egg

buttermilk

canola or vegetable oil

rounded tablespoons vanilla/plain Greek yogurt or sour cream

vanilla extract

mini semi-sweet chocolate chips (full-size may be used but are more likely to sink)